There's a thread over on Benzworld by a guy who got a C249F code, took it to the dealer under the extended SBC warranty, and all they did was reset the counter (presumably not to zerio). I know that some earlier SBC units had an unnecessarily low threshold (400k I think it was) but the later units had a threshold of 600k. Well, this guy has a 2006 CDI. It surprises me that, with a model year that recent, they wouldn't simply replace the pump.

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife